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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">critical_points_sub_pix</span><span data-if="c" style="display:none;">T_critical_points_sub_pix</span><span data-if="cpp" style="display:none;">CriticalPointsSubPix</span><span data-if="dotnet" style="display:none;">CriticalPointsSubPix</span><span data-if="python" style="display:none;">critical_points_sub_pix</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">critical_points_sub_pix</span><span data-if="c" style="display:none;">T_critical_points_sub_pix</span><span data-if="cpp" style="display:none;">CriticalPointsSubPix</span><span data-if="dotnet" style="display:none;">CriticalPointsSubPix</span><span data-if="python" style="display:none;">critical_points_sub_pix</span></code> — Subpixel precise detection of critical points in an image.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>critical_points_sub_pix</b>(<a href="#Image"><i>Image</i></a> :  : <a href="#Filter"><i>Filter</i></a>, <a href="#Sigma"><i>Sigma</i></a>, <a href="#Threshold"><i>Threshold</i></a> : <a href="#RowMin"><i>RowMin</i></a>, <a href="#ColumnMin"><i>ColumnMin</i></a>, <a href="#RowMax"><i>RowMax</i></a>, <a href="#ColumnMax"><i>ColumnMax</i></a>, <a href="#RowSaddle"><i>RowSaddle</i></a>, <a href="#ColumnSaddle"><i>ColumnSaddle</i></a>)</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>T_critical_points_sub_pix</b>(const Hobject <a href="#Image"><i>Image</i></a>, const Htuple <a href="#Filter"><i>Filter</i></a>, const Htuple <a href="#Sigma"><i>Sigma</i></a>, const Htuple <a href="#Threshold"><i>Threshold</i></a>, Htuple* <a href="#RowMin"><i>RowMin</i></a>, Htuple* <a href="#ColumnMin"><i>ColumnMin</i></a>, Htuple* <a href="#RowMax"><i>RowMax</i></a>, Htuple* <a href="#ColumnMax"><i>ColumnMax</i></a>, Htuple* <a href="#RowSaddle"><i>RowSaddle</i></a>, Htuple* <a href="#ColumnSaddle"><i>ColumnSaddle</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>CriticalPointsSubPix</b>(const HObject&amp; <a href="#Image"><i>Image</i></a>, const HTuple&amp; <a href="#Filter"><i>Filter</i></a>, const HTuple&amp; <a href="#Sigma"><i>Sigma</i></a>, const HTuple&amp; <a href="#Threshold"><i>Threshold</i></a>, HTuple* <a href="#RowMin"><i>RowMin</i></a>, HTuple* <a href="#ColumnMin"><i>ColumnMin</i></a>, HTuple* <a href="#RowMax"><i>RowMax</i></a>, HTuple* <a href="#ColumnMax"><i>ColumnMax</i></a>, HTuple* <a href="#RowSaddle"><i>RowSaddle</i></a>, HTuple* <a href="#ColumnSaddle"><i>ColumnSaddle</i></a>)</code></p>
<p>
<code>void <a href="HImage.html">HImage</a>::<b>CriticalPointsSubPix</b>(const HString&amp; <a href="#Filter"><i>Filter</i></a>, double <a href="#Sigma"><i>Sigma</i></a>, double <a href="#Threshold"><i>Threshold</i></a>, HTuple* <a href="#RowMin"><i>RowMin</i></a>, HTuple* <a href="#ColumnMin"><i>ColumnMin</i></a>, HTuple* <a href="#RowMax"><i>RowMax</i></a>, HTuple* <a href="#ColumnMax"><i>ColumnMax</i></a>, HTuple* <a href="#RowSaddle"><i>RowSaddle</i></a>, HTuple* <a href="#ColumnSaddle"><i>ColumnSaddle</i></a>) const</code></p>
<p>
<code>void <a href="HImage.html">HImage</a>::<b>CriticalPointsSubPix</b>(const char* <a href="#Filter"><i>Filter</i></a>, double <a href="#Sigma"><i>Sigma</i></a>, double <a href="#Threshold"><i>Threshold</i></a>, HTuple* <a href="#RowMin"><i>RowMin</i></a>, HTuple* <a href="#ColumnMin"><i>ColumnMin</i></a>, HTuple* <a href="#RowMax"><i>RowMax</i></a>, HTuple* <a href="#ColumnMax"><i>ColumnMax</i></a>, HTuple* <a href="#RowSaddle"><i>RowSaddle</i></a>, HTuple* <a href="#ColumnSaddle"><i>ColumnSaddle</i></a>) const</code></p>
<p>
<code>void <a href="HImage.html">HImage</a>::<b>CriticalPointsSubPix</b>(const wchar_t* <a href="#Filter"><i>Filter</i></a>, double <a href="#Sigma"><i>Sigma</i></a>, double <a href="#Threshold"><i>Threshold</i></a>, HTuple* <a href="#RowMin"><i>RowMin</i></a>, HTuple* <a href="#ColumnMin"><i>ColumnMin</i></a>, HTuple* <a href="#RowMax"><i>RowMax</i></a>, HTuple* <a href="#ColumnMax"><i>ColumnMax</i></a>, HTuple* <a href="#RowSaddle"><i>RowSaddle</i></a>, HTuple* <a href="#ColumnSaddle"><i>ColumnSaddle</i></a>) const  <span class="signnote">
            (
            Windows only)
          </span></code></p>
</div>
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<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>CriticalPointsSubPix</b>(<a href="HObject.html">HObject</a> <a href="#Image"><i>image</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Filter"><i>filter</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Sigma"><i>sigma</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Threshold"><i>threshold</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#RowMin"><i>rowMin</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#ColumnMin"><i>columnMin</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#RowMax"><i>rowMax</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#ColumnMax"><i>columnMax</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#RowSaddle"><i>rowSaddle</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#ColumnSaddle"><i>columnSaddle</i></a>)</code></p>
<p>
<code>void <a href="HImage.html">HImage</a>.<b>CriticalPointsSubPix</b>(string <a href="#Filter"><i>filter</i></a>, double <a href="#Sigma"><i>sigma</i></a>, double <a href="#Threshold"><i>threshold</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#RowMin"><i>rowMin</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#ColumnMin"><i>columnMin</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#RowMax"><i>rowMax</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#ColumnMax"><i>columnMax</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#RowSaddle"><i>rowSaddle</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#ColumnSaddle"><i>columnSaddle</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>critical_points_sub_pix</b>(<a href="#Image"><i>image</i></a>: HObject, <a href="#Filter"><i>filter</i></a>: str, <a href="#Sigma"><i>sigma</i></a>: float, <a href="#Threshold"><i>threshold</i></a>: float) -&gt; Tuple[Sequence[float], Sequence[float], Sequence[float], Sequence[float], Sequence[float], Sequence[float]]</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">critical_points_sub_pix</span><span data-if="c" style="display:none">critical_points_sub_pix</span><span data-if="cpp" style="display:none">CriticalPointsSubPix</span><span data-if="com" style="display:none">CriticalPointsSubPix</span><span data-if="dotnet" style="display:none">CriticalPointsSubPix</span><span data-if="python" style="display:none">critical_points_sub_pix</span></code> extracts critical points, i.e., local
maxima, local minima, and saddle points, from the image <a href="#Image"><i><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></i></a> with
subpixel precision.
To do so, in each point the input image is approximated by a quadratic
polynomial in x and y and subsequently the polynomial is examined for
extremal values and saddle points. The partial derivatives, which are
necessary for setting up the polynomial, are calculated either with various
Gaussian derivatives or using the facet model, depending on <a href="#Filter"><i><code><span data-if="hdevelop" style="display:inline">Filter</span><span data-if="c" style="display:none">Filter</span><span data-if="cpp" style="display:none">Filter</span><span data-if="com" style="display:none">Filter</span><span data-if="dotnet" style="display:none">filter</span><span data-if="python" style="display:none">filter</span></code></i></a>.
In the first case, <a href="#Sigma"><i><code><span data-if="hdevelop" style="display:inline">Sigma</span><span data-if="c" style="display:none">Sigma</span><span data-if="cpp" style="display:none">Sigma</span><span data-if="com" style="display:none">Sigma</span><span data-if="dotnet" style="display:none">sigma</span><span data-if="python" style="display:none">sigma</span></code></i></a> determines the size of the Gaussian
kernels, while in the second case, before being processed the input image is
smoothed by a Gaussian whose size is determined by <a href="#Sigma"><i><code><span data-if="hdevelop" style="display:inline">Sigma</span><span data-if="c" style="display:none">Sigma</span><span data-if="cpp" style="display:none">Sigma</span><span data-if="com" style="display:none">Sigma</span><span data-if="dotnet" style="display:none">sigma</span><span data-if="python" style="display:none">sigma</span></code></i></a>.
Therefore, <i><span data-if="hdevelop" style="display:inline">'facet'</span><span data-if="c" style="display:none">"facet"</span><span data-if="cpp" style="display:none">"facet"</span><span data-if="com" style="display:none">"facet"</span><span data-if="dotnet" style="display:none">"facet"</span><span data-if="python" style="display:none">"facet"</span></i> results in a faster extraction at the expense
of slightly less accurate results. A point
is accepted to be a critical point if the absolute values of both
eigenvalues of the Hessian matrix are greater than <a href="#Threshold"><i><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></i></a>. The
eigenvalues correspond to the curvature of the gray
value surface. If both eigenvalues are negative, the point is a local
maximum, if both are positive, a local minimum, and if they have different
signs, a saddle point.
</p>
<h2 id="sec_attention">注意</h2>
<p>Note that filter operators may return unexpected results if
an image with a reduced domain is used as input. Please refer to the
chapter <a href="toc_filters.html">过滤器</a>.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  
    <li>Automatically parallelized on internal data level.</li>
  
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="Image" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></b> (input_object)  </span><span>singlechannelimage <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject</span> (byte / int1 / int2 / uint2 / int4 / real)</span>
</div>
<p class="pardesc">Input image.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Filter" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Filter</span><span data-if="c" style="display:none">Filter</span><span data-if="cpp" style="display:none">Filter</span><span data-if="com" style="display:none">Filter</span><span data-if="dotnet" style="display:none">filter</span><span data-if="python" style="display:none">filter</span></code></b> (input_control)  </span><span>string <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">str</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (string)</span><span data-if="dotnet" style="display:none"> (<i>string</i>)</span><span data-if="cpp" style="display:none"> (<i>HString</i>)</span><span data-if="c" style="display:none"> (<i>char*</i>)</span></span>
</div>
<p class="pardesc">Method for the calculation of the partial derivatives.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>
    <span data-if="hdevelop" style="display:inline">'facet'</span>
    <span data-if="c" style="display:none">"facet"</span>
    <span data-if="cpp" style="display:none">"facet"</span>
    <span data-if="com" style="display:none">"facet"</span>
    <span data-if="dotnet" style="display:none">"facet"</span>
    <span data-if="python" style="display:none">"facet"</span>
</p>
<p class="pardesc"><span class="parcat">List of values:
      </span><span data-if="hdevelop" style="display:inline">'facet'</span><span data-if="c" style="display:none">"facet"</span><span data-if="cpp" style="display:none">"facet"</span><span data-if="com" style="display:none">"facet"</span><span data-if="dotnet" style="display:none">"facet"</span><span data-if="python" style="display:none">"facet"</span>, <span data-if="hdevelop" style="display:inline">'gauss'</span><span data-if="c" style="display:none">"gauss"</span><span data-if="cpp" style="display:none">"gauss"</span><span data-if="com" style="display:none">"gauss"</span><span data-if="dotnet" style="display:none">"gauss"</span><span data-if="python" style="display:none">"gauss"</span></p>
</div>
  <div class="par">
<div class="parhead">
<span id="Sigma" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Sigma</span><span data-if="c" style="display:none">Sigma</span><span data-if="cpp" style="display:none">Sigma</span><span data-if="com" style="display:none">Sigma</span><span data-if="dotnet" style="display:none">sigma</span><span data-if="python" style="display:none">sigma</span></code></b> (input_control)  </span><span>real <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">float</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Sigma of the Gaussian.
If <a href="#Filter"><i><code><span data-if="hdevelop" style="display:inline">Filter</span><span data-if="c" style="display:none">Filter</span><span data-if="cpp" style="display:none">Filter</span><span data-if="com" style="display:none">Filter</span><span data-if="dotnet" style="display:none">filter</span><span data-if="python" style="display:none">filter</span></code></i></a> is 'facet', <a href="#Sigma"><i><code><span data-if="hdevelop" style="display:inline">Sigma</span><span data-if="c" style="display:none">Sigma</span><span data-if="cpp" style="display:none">Sigma</span><span data-if="com" style="display:none">Sigma</span><span data-if="dotnet" style="display:none">sigma</span><span data-if="python" style="display:none">sigma</span></code></i></a> may be 0.0
to avoid the smoothing of the input image.</p>
<p class="pardesc"><span class="parcat">Suggested values:
      </span>0.7, 0.8, 0.9, 1.0, 1.2, 1.5, 2.0, 3.0</p>
<p class="pardesc"><span class="parcat">Restriction:
      </span><code>Sigma &gt;= 0.0</code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="Threshold" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></b> (input_control)  </span><span>real <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">float</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Minimum absolute value of the eigenvalues of the
Hessian matrix.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>5.0</p>
<p class="pardesc"><span class="parcat">Suggested values:
      </span>2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0</p>
<p class="pardesc"><span class="parcat">Restriction:
      </span><code>Threshold &gt;= 0.0</code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="RowMin" class="parname"><b><code><span data-if="hdevelop" style="display:inline">RowMin</span><span data-if="c" style="display:none">RowMin</span><span data-if="cpp" style="display:none">RowMin</span><span data-if="com" style="display:none">RowMin</span><span data-if="dotnet" style="display:none">rowMin</span><span data-if="python" style="display:none">row_min</span></code></b> (output_control)  </span><span>point.y-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Row coordinates of the detected minima.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="ColumnMin" class="parname"><b><code><span data-if="hdevelop" style="display:inline">ColumnMin</span><span data-if="c" style="display:none">ColumnMin</span><span data-if="cpp" style="display:none">ColumnMin</span><span data-if="com" style="display:none">ColumnMin</span><span data-if="dotnet" style="display:none">columnMin</span><span data-if="python" style="display:none">column_min</span></code></b> (output_control)  </span><span>point.x-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Column coordinates of the detected minima.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="RowMax" class="parname"><b><code><span data-if="hdevelop" style="display:inline">RowMax</span><span data-if="c" style="display:none">RowMax</span><span data-if="cpp" style="display:none">RowMax</span><span data-if="com" style="display:none">RowMax</span><span data-if="dotnet" style="display:none">rowMax</span><span data-if="python" style="display:none">row_max</span></code></b> (output_control)  </span><span>point.y-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Row coordinates of the detected maxima.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="ColumnMax" class="parname"><b><code><span data-if="hdevelop" style="display:inline">ColumnMax</span><span data-if="c" style="display:none">ColumnMax</span><span data-if="cpp" style="display:none">ColumnMax</span><span data-if="com" style="display:none">ColumnMax</span><span data-if="dotnet" style="display:none">columnMax</span><span data-if="python" style="display:none">column_max</span></code></b> (output_control)  </span><span>point.x-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Column coordinates of the detected maxima.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="RowSaddle" class="parname"><b><code><span data-if="hdevelop" style="display:inline">RowSaddle</span><span data-if="c" style="display:none">RowSaddle</span><span data-if="cpp" style="display:none">RowSaddle</span><span data-if="com" style="display:none">RowSaddle</span><span data-if="dotnet" style="display:none">rowSaddle</span><span data-if="python" style="display:none">row_saddle</span></code></b> (output_control)  </span><span>point.y-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Row coordinates of the detected saddle points.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="ColumnSaddle" class="parname"><b><code><span data-if="hdevelop" style="display:inline">ColumnSaddle</span><span data-if="c" style="display:none">ColumnSaddle</span><span data-if="cpp" style="display:none">ColumnSaddle</span><span data-if="com" style="display:none">ColumnSaddle</span><span data-if="dotnet" style="display:none">columnSaddle</span><span data-if="python" style="display:none">column_saddle</span></code></b> (output_control)  </span><span>point.x-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Column coordinates of the detected saddle points.</p>
</div>
<h2 id="sec_result">结果</h2>
<p><code><span data-if="hdevelop" style="display:inline">critical_points_sub_pix</span><span data-if="c" style="display:none">critical_points_sub_pix</span><span data-if="cpp" style="display:none">CriticalPointsSubPix</span><span data-if="com" style="display:none">CriticalPointsSubPix</span><span data-if="dotnet" style="display:none">CriticalPointsSubPix</span><span data-if="python" style="display:none">critical_points_sub_pix</span></code> returns <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
     if all parameters are
correct and no error occurs during the execution.  If the input is
empty the behavior can be set via
<a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system('no_object_result',&lt;Result&gt;)</span><span data-if="c" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span></code></a>.  If necessary, an
exception is raised.</p>
<h2 id="sec_successors">可能的后置算子</h2>
<p>
<code><a href="gen_cross_contour_xld.html"><span data-if="hdevelop" style="display:inline">gen_cross_contour_xld</span><span data-if="c" style="display:none">gen_cross_contour_xld</span><span data-if="cpp" style="display:none">GenCrossContourXld</span><span data-if="com" style="display:none">GenCrossContourXld</span><span data-if="dotnet" style="display:none">GenCrossContourXld</span><span data-if="python" style="display:none">gen_cross_contour_xld</span></a></code>, 
<code><a href="disp_cross.html"><span data-if="hdevelop" style="display:inline">disp_cross</span><span data-if="c" style="display:none">disp_cross</span><span data-if="cpp" style="display:none">DispCross</span><span data-if="com" style="display:none">DispCross</span><span data-if="dotnet" style="display:none">DispCross</span><span data-if="python" style="display:none">disp_cross</span></a></code>
</p>
<h2 id="sec_alternatives">可替代算子</h2>
<p>
<code><a href="local_min_sub_pix.html"><span data-if="hdevelop" style="display:inline">local_min_sub_pix</span><span data-if="c" style="display:none">local_min_sub_pix</span><span data-if="cpp" style="display:none">LocalMinSubPix</span><span data-if="com" style="display:none">LocalMinSubPix</span><span data-if="dotnet" style="display:none">LocalMinSubPix</span><span data-if="python" style="display:none">local_min_sub_pix</span></a></code>, 
<code><a href="local_max_sub_pix.html"><span data-if="hdevelop" style="display:inline">local_max_sub_pix</span><span data-if="c" style="display:none">local_max_sub_pix</span><span data-if="cpp" style="display:none">LocalMaxSubPix</span><span data-if="com" style="display:none">LocalMaxSubPix</span><span data-if="dotnet" style="display:none">LocalMaxSubPix</span><span data-if="python" style="display:none">local_max_sub_pix</span></a></code>, 
<code><a href="saddle_points_sub_pix.html"><span data-if="hdevelop" style="display:inline">saddle_points_sub_pix</span><span data-if="c" style="display:none">saddle_points_sub_pix</span><span data-if="cpp" style="display:none">SaddlePointsSubPix</span><span data-if="com" style="display:none">SaddlePointsSubPix</span><span data-if="dotnet" style="display:none">SaddlePointsSubPix</span><span data-if="python" style="display:none">saddle_points_sub_pix</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="local_min.html"><span data-if="hdevelop" style="display:inline">local_min</span><span data-if="c" style="display:none">local_min</span><span data-if="cpp" style="display:none">LocalMin</span><span data-if="com" style="display:none">LocalMin</span><span data-if="dotnet" style="display:none">LocalMin</span><span data-if="python" style="display:none">local_min</span></a></code>, 
<code><a href="local_max.html"><span data-if="hdevelop" style="display:inline">local_max</span><span data-if="c" style="display:none">local_max</span><span data-if="cpp" style="display:none">LocalMax</span><span data-if="com" style="display:none">LocalMax</span><span data-if="dotnet" style="display:none">LocalMax</span><span data-if="python" style="display:none">local_max</span></a></code>, 
<code><a href="plateaus.html"><span data-if="hdevelop" style="display:inline">plateaus</span><span data-if="c" style="display:none">plateaus</span><span data-if="cpp" style="display:none">Plateaus</span><span data-if="com" style="display:none">Plateaus</span><span data-if="dotnet" style="display:none">Plateaus</span><span data-if="python" style="display:none">plateaus</span></a></code>, 
<code><a href="plateaus_center.html"><span data-if="hdevelop" style="display:inline">plateaus_center</span><span data-if="c" style="display:none">plateaus_center</span><span data-if="cpp" style="display:none">PlateausCenter</span><span data-if="com" style="display:none">PlateausCenter</span><span data-if="dotnet" style="display:none">PlateausCenter</span><span data-if="python" style="display:none">plateaus_center</span></a></code>, 
<code><a href="lowlands.html"><span data-if="hdevelop" style="display:inline">lowlands</span><span data-if="c" style="display:none">lowlands</span><span data-if="cpp" style="display:none">Lowlands</span><span data-if="com" style="display:none">Lowlands</span><span data-if="dotnet" style="display:none">Lowlands</span><span data-if="python" style="display:none">lowlands</span></a></code>, 
<code><a href="lowlands_center.html"><span data-if="hdevelop" style="display:inline">lowlands_center</span><span data-if="c" style="display:none">lowlands_center</span><span data-if="cpp" style="display:none">LowlandsCenter</span><span data-if="com" style="display:none">LowlandsCenter</span><span data-if="dotnet" style="display:none">LowlandsCenter</span><span data-if="python" style="display:none">lowlands_center</span></a></code>
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
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